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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        let year=prompt('请输入年份');
        if(year % 4 == 0 && year % 100 !== 0 || year % 400 ==0){
            console.log('闰年');
        }else{
            console.log('平年');
        }
    </script>
</body>
</html>